4.1.7 Compression Options

Create backup in compressed format. For a regular backup,
only the InnoDB data files are created in compressed format,
using the .ibz extension. For a
single-image backup, again only the InnoDB data files are
compressed inside the backup image.

Default: compression is disabled. Default compression level
is 1 when compression is enabled. You can change the amount
of compression with the
compress-level option.